You can see my sig for mods.. Truck tows fine, but I think it should get up to speed quicker with 6500bs behind it. I have 4.10's now. Would going 4.56 help a lot or just burn more gas?

 

I can't even begin to fathom how bad of gas mileage you get. I wouldn't swap myself because on the highway you'd be turning some serious gas sucking rpms. If you're running a stock compression LQ4, I would start by upping the compression 1 point or more. This will get you a good amount of torque across the board. Might as well get ported heads while you're at it....that will help the cam out down low .

 

I tuned it myself and drove from Tampa, Florida to Walker, LA and avg'd 12 to 13mpg with a 6500 to 7klb load going 65mph. Going back home with just the 3100lb trailor I got 15mpg. I made a trip to Vero Beach months ago and got 18mpg going 55mph. When the truck was stock I got 10 to 12mpg on the highway unloaded. I have the timing bumped up pretty good and only run 93 octane loaded and 89 unloaded.

 

Bump the compression to 11:1 (mill down 243s) and run 93 all the time. That's what I would do.

 

You think that's better than going gears? How much of an increase in tq/hp are we talking?

 

Yes, I think it's better, because not only will you see the gains from the increased compression (1 point is generally worth 4-6% increase in torque throughout the powerband) but it will also make your cam better by increasing the dynamic compression. The increased compression should also improve the efficiency of your engine as well.

You could find some cheap 243/799 heads and take them to a machine shop and have them mill them and do a good valve job. I've read that a good valve job is what accounts for a good amount of the flow rate increases of ported heads.

 

Never thought of that option. Thanks...